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post #1 of 9 Old 10-10-2014, 12:50 PM Thread Starter
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GM Engineers discussing intake valve coking

The new LT5 Gen5 650hp V8 is covered in great detail int he latest Hot Rod mag. Here is some info:

Dec 2014 Hotrod Mag on the new LT4 power house and changes they are making to address the oil ingestion and intake valve coking. This is the FIRST time I have seen any major automaker even admit to the issues, and these engineers sound like a reply of what I have been preaching for years:

http://www.hotrod.com/feature_stories/1 ... ewall.html

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post #2 of 9 Old 10-10-2014, 03:57 PM
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Is the link working? It didn't for me but might be the weather ... I have the hard copy, soI'm asking for others ...

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post #3 of 9 Old 10-10-2014, 06:24 PM
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Is the link working? It didn't for me but might be the weather ... I have the hard copy, soI'm asking for others ...
Nope, that link is incomplete, no chance in hell of it working!

But this one will:

LT4

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post #4 of 9 Old 10-11-2014, 12:25 PM Thread Starter
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Thanks Chuck!!!
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post #5 of 9 Old 10-11-2014, 03:21 PM
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Thanks Chuck!!!
Contrary to popular belief I'm here to help!

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post #6 of 9 Old 10-12-2014, 09:02 AM Thread Starter
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Quote:
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Contrary to popular belief I'm here to help!
Your usually a great contributor to the site and a asset to the members. Usually.....
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post #7 of 9 Old 10-12-2014, 01:32 PM
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So does this mean the necessity of catch cans will be obsolete??

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post #8 of 9 Old 10-13-2014, 08:42 AM
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Your usually a great contributor to the site and a asset to the members. Usually.....
Usually....


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post #9 of 9 Old 10-13-2014, 09:09 AM Thread Starter
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So does this mean the necessity of catch cans will be obsolete??
GM has (and many other auto makers) reached the top of the effectiveness on trapping and separating the oil from the PCV vapors, which falls into 20-25% maximum before they also are trapping and retaining the damaging combustion byproducts that must be evacuated before they can settle and contaminate the engine oil, so they have taken it as far as they can. To prevent coking and the other issues related to the ingestion. Until a system is designed that does not need to be serviced, all DI engines need to eliminate all the oil and other compounds that cause coking from the PCV vapors. And only a external system that needs to be emptied can accomplish this...and only a couple of those trap c lose to all. Most only trap 15-30% and our solution for tier one OEM is still several years before all hoops with the EPA, etc. have been jumped through.

So, great to see the changes made, and that they are acknowledging the issue (contrary to the PR talking heads that just a few months ago claimed they "have no issues with coking". These "Real" engineers talked straight in this article. And ALL automakers are making these changes, but no other has admitted in public it exists contrary to all the documentation available.
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